Siemens LOGO! Series - Pulse Relay

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
229
4.4.24 Pulse relay
Short description
A short pulse at the input sets and resets the output.
Symbol in LOGO! Wiring Description
Input Trg You set and reset output Q with a signal at input Trg
(Trigger).
Input S You set output Q with a signal at input S.
Input R You reset output Q with a signal at input R.
Parameter Selection:
RS (R input priority) or
SR (S input priority)
Retentivity:
/ = No retentivity
R = The status is retentive.
56
4
7UJ
6
5
3DU
Output Q Q is set with a signal at Trg, and reset with the next
signal at Trg, if S and R = 0.
Timing diagram
6
5
4
7UJ
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WLPLQJGLDJUDPLVDOVRVKRZQ
LQWKHV\PEROIRUWKHSXOVH
UHOD\
Functional description
Output Q changes its status; that is, the output is set or reset with each 0 to 1 transition at
input Trg and if the inputs S and R = 0.
The signal at input Trg does not influence the special function when S or R = 1.
You set the pulse relay with a signal at input S. The output is set hi.
You reset the pulse relay with a signal at input R. The output is set lo.